This thread, and site, tells the tale. Google is using this for marketing purposes. They already have some trite 2 minute marketing ad running as well. The deal

This thread, and site, tells the tale. Google is using this for marketing purposes. They already have some trite 2 minute marketing ad running as well. The deal that Twitter received is going to come with extensive incentives unavailable to typical operations. Twitter also was likely able to play the typical providers against each other. 'Oh, well AWS is offering me [x,y,z]. Can you do better?'